Finding the Fourth Proportional to 31,408.61, 47,119.31 and 28,271.79

Step by Step Solution

1. Step 1: Write the proportion equation
   31,408.61 : 47,119.31 = 28,271.79 : x
2. Step 2: Convert to fraction form
   31,408.61/47,119.31 = 28,271.79/x
3. Step 3: Cross multiply
   31,408.61x = 47,119.31 × 28,271.79
4. Step 4: Simplify right side
   31,408.61x = 1,332,147,095.91
5. Step 5: Solve for x
   x = 1,332,147,095.91/31,408.61
6. Step 6: Final answer
   x = 42,413.44